[Compatibility] For Holmes air purifier filters: HAPF600 filter, HAPF600D,HAP615, HAP625, HAP650, HAP675, HAP675RC, HAP725, HAP750, HAP756, HAP759, HAP1625, HAP1650, HAP1725, HAP1750, HAP616B-TU, HAP633-U, HAP8615, HAP8650, HAP8756. Replacement for Bionaire models: BAP615, BAP625, BAP650, BAP1125, BAP1150, BAP 1175, BAP1225, BAP1250, BAP1300. Replacement for GE Models: 106633,106643,106653,106569,106853. [High quality material] For Holmes hapf600,The product uses PP high efficiency filter paper,compatible with for holmes, acid and alkali resistant, corrosion resistant, high melting point, low resistance, high efficiency, high strength, environmental protection, etc. Filtration effect can achieve H12 level. [High Energy and High Efficiency] For Hapf600 hepa filter,Made of very fine organic fibers interwoven, hapf600 carbon filter has a strong ability to capture particles, tiny pore size, high adsorption capacity, high purification efficiency, and water absorption, with a purification rate of 99.97% for 0.3 Micrometre particles. In other words, only 3 out of every 10,000 particles can penetrate for holmes air purifier filters for hapf600 [Value Pack ] Provide customers with enough HEPA filters to replace. For the best filtration effect, we recommend you to replace the old HEPA filter every 3-4 months, and replace the pre-filter once every 1-2 months. Colour: as shown Material: plastic + activated carbon Package Contents: 2 * HEPA filters 4 * Activated carbon filters